CN204044958U - A kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system - Google Patents
A kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system Download PDFInfo
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- CN204044958U CN204044958U CN201420527913.4U CN201420527913U CN204044958U CN 204044958 U CN204044958 U CN 204044958U CN 201420527913 U CN201420527913 U CN 201420527913U CN 204044958 U CN204044958 U CN 204044958U
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Abstract
The utility model discloses a kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system, it comprises transmitter module, receiver module, Doppler's extraction module, amplification module, message processing module, local oscillator, frequency mixer, filtration module, intermediate frequency amplification module and analog-to-digital conversion module, transmitter module will transmit and be transmitted into leaky cable A, receiver module receives the leakage signal that leaky cable B transmits, the leakage signal that receiver module receives by frequency mixer and the oscillator signal that local oscillator sends carry out mixing, the interference that filtration module filtering electric pulse causes, pass the signal to intermediate frequency amplification module after filtration module filtering interfering and carry out intermediate frequency amplification, Doppler's extraction module carries out Doppler signal extraction to the signal after intermediate frequency amplification, amplification module carries out amplification process to the Doppler signal extracted, and the signal after amplifying is sent to the treatment and analysis that message processing module carries out Doppler signal.
Description
Technical field
The utility model relates to a kind of leakage cable intrusion detector, particularly relates to a kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system.
Background technology
Leaky cable is usually again referred to as leakage induction cable, and leaky cable integrates the function such as Signal transmissions, launching and receiving, has the double action of concentric cable and antenna simultaneously, is a kind of telecommunication cable.Leaky cable is mainly used in outdoor perimeter intrusion detecting system, itself is not or does not possess warning function, be responsible for the parts mainly leakage cable intrusion detector judging and report to the police, leakage cable intrusion detector is the signals leakiness principle utilizing leaky cable, the perimeter alarm product made.Be widely used in the places such as turnkey institute, villa community, Wen Bo unit, border, airport, military key area.
Conventional leak cable intrusion detector detects invasion: two leaky cables laid, form an invisible cylindricality electromagnetic field zone of protection in-between, when human body, metallic object move in this radio-frequency (RF) magnetic field region, detect with regard to causing electromagnetic field magnitude and phase perturbation and being detected device, and produce alerting signal, reach warning object.
Because conventional category-B leakage cable intrusion detector receiver module uses the direct frequency-selecting amplifying signal of wave filter of nominal operating frequency value, cheap and its absolute bandwidth is very wide, receiving system is easy to be subject to the interference of environment electric pulse and causes rate of false alarm to increase, and makes troubles to use.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion system is proposed, even if working environment exists impulse disturbances, the narrow-band reception modular filtration band electrical pulse interference of device also can be detected.
The purpose of this utility model is achieved through the following technical solutions: a kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system, it comprises transmitter module, receiver module, Doppler's extraction module, amplification module and message processing module, it also comprises local oscillator, frequency mixer, filtration module, intermediate frequency amplification module and analog-to-digital conversion module, the signal of transmitter module exports and is connected with leaky cable A, transmitter module will transmit and be transmitted into leaky cable A, receiver module receives the leakage signal that leaky cable B transmits, an input of frequency mixer is connected with the output of receiver module, another input of frequency mixer is connected with the output of local oscillator, the leakage signal that receiver module receives by frequency mixer and the oscillator signal that local oscillator sends carry out mixing, the signal of frequency mixer exports and is connected with the signal input of filtration module, the interference that filtration module filtering electric pulse causes, pass the signal to intermediate frequency amplification module after filtration module filtering interfering and carry out intermediate frequency amplification, Doppler's extraction module carries out Doppler signal extraction to the signal after intermediate frequency amplification, amplification module carries out amplification process to the Doppler signal extracted, and the signal after amplifying is sent to the treatment and analysis that message processing module carries out Doppler signal.
It also comprises record storage, and described record storage is connected with message processing module, and the leakage signal of this reception and analysis processing result thereof are sent to record storage and preserve by message processing module, so that host computer extracts historical data.
Described amplification module is the amplifier of level Four cascade.
Described amplification module is programmable amplifier, and programmable amplifier is made up of operational amplifier and periphery resistor network.
It also comprises keyboard and display, described keyboard is connected with the input through keyboard of message processing module, can parameters information by keyboard, display is connected with the display translation of message processing module, display display configuration information, analysis processing result and warning message.
It also comprises power module, and described power module is connected with transmitter module, receiver module and message processing module, for it provides power supply.
It also comprises phase demodulation modules, and the input of described phase demodulation modules is connected with the output of Doppler's extraction module, and the output of phase demodulation modules is connected with the input of amplification module.
It also comprises power splitter, and the input of described power splitter is connected with the output of local oscillator, and an output of power splitter is connected with the input of transmitter module, and another of power splitter exports to input with one of frequency mixer and be connected.
Described power splitter is one-to-two power splitter.
The beneficial effects of the utility model are: the utility model is a kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system, frequency conversion narrow-band reception module is added in intrusion detector inside, even if use in the environment disturbed there being electric pulse, narrow band filter also can reduce the interference that electric pulse causes, thus reaches the object reducing rate of false alarm.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the utility model intrusion detector;
Fig. 2 is the theory diagram of the utility model Doppler extraction module.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail, but protection domain of the present utility model is not limited to the following stated.
As shown in Figure 1, a kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system, it comprises transmitter module, receiver module, Doppler's extraction module, amplification module and message processing module, it also comprises local oscillator, frequency mixer, filtration module, intermediate frequency amplification module and analog-to-digital conversion module, the signal of transmitter module exports and is connected with leaky cable A, transmitter module will transmit and be transmitted into leaky cable A, receiver module receives the leakage signal that leaky cable B transmits, an input of frequency mixer is connected with the output of receiver module, another input of frequency mixer is connected with the output of local oscillator, the leakage signal that receiver module receives by frequency mixer and the oscillator signal that local oscillator sends carry out mixing, the signal of frequency mixer exports and is connected with the signal input of filtration module, the interference that filtration module filtering electric pulse causes, pass the signal to intermediate frequency amplification module after filtration module filtering interfering and carry out intermediate frequency amplification, Doppler's extraction module carries out Doppler signal extraction to the signal after intermediate frequency amplification, amplification module carries out amplification process to the Doppler signal extracted, and the signal after amplifying is sent to the treatment and analysis that message processing module carries out Doppler signal.
It also comprises record storage, and described record storage is connected with message processing module, and the leakage signal of this reception and analysis processing result thereof are sent to record storage and preserve by message processing module, so that host computer extracts historical data.
Described filtration module can be narrow band filter, and intermediate frequency amplification module is intermediate frequency amplifier, and intermediate frequency amplifier is the one of power amplifier, has the function of frequency-selecting simultaneously, namely to the gain higher than other frequency ranges of the power gain of special frequency channel.
Described amplification module is the amplifier of level Four cascade.
Described amplification module is programmable amplifier, and programmable amplifier is made up of operational amplifier and periphery resistor network.
It also comprises keyboard and display, described keyboard is connected with the input through keyboard of message processing module, can parameters information by keyboard, display is connected with the display translation of message processing module, display display configuration information, analysis processing result and warning message.
It also comprises power module, and described power module is connected with transmitter module, receiver module and message processing module, for it provides power supply.
As shown in Figure 2, the utility model can also comprise phase demodulation modules, and the input of described phase demodulation modules is connected with the output of Doppler's extraction module, and the output of phase demodulation modules is connected with the input of amplification module.
It also comprises power splitter, and the input of described power splitter is connected with the output of local oscillator, and an output of power splitter is connected with the input of transmitter module, and another of power splitter exports to input with one of frequency mixer and be connected.
Described power splitter is one-to-two power splitter.
Described amplification module is that programmable amplifier is made up of operational amplifier and periphery resistor network.
It also comprises warning horn, and warning horn comprises hummer and signal lamp, for warning of reporting to the police.
The utility model sets up local oscillator and power splitter, stable transmit output and local oscillation signal input is provided, by filtering module for filtering off signal disturbing, and Doppler's extraction module is improved, set up phase demodulator, make intrusion detector when receiving and transmitting, even if the phase place of this signal offsets, the invasion signal wave momentum that improvement Doppler extraction module detects can't fluctuate along with phase fluctuation, thus improves stability and the reliability of intrusion detector sensitivity.
The utility model has alarm logging local storage function, when there being alerting signal to produce, first carrying out this locality and storing, then by switching value or bus output information.
Even if do not install receiving host machine owing to adding alarm logging storer user in detector inside, user also can understand warning message by the record consulted above detector, also can send instruction fetch warning message by host computer afterwards, be user-friendly to.
The utility model is a kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system, frequency conversion narrow-band reception module is added in intrusion detector inside, even if use in the environment disturbed there being electric pulse, narrow band filter also can reduce the interference that electric pulse causes, thus reaches the object reducing rate of false alarm.
Claims (9)
1. one kind has the low rate of false alarm leakage cable intrusion detector of arrowband frequency conversion receiving system, it comprises transmitter module, receiver module, Doppler's extraction module, amplification module and message processing module, it is characterized in that: it also comprises local oscillator, frequency mixer, filtration module, intermediate frequency amplification module and analog-to-digital conversion module, the signal of transmitter module exports and is connected with leaky cable A, transmitter module will transmit and be transmitted into leaky cable A, receiver module receives the leakage signal that leaky cable B transmits, an input of frequency mixer is connected with the output of receiver module, another input of frequency mixer is connected with the output of local oscillator, the leakage signal that receiver module receives by frequency mixer and the oscillator signal that local oscillator sends carry out mixing, the signal of frequency mixer exports and is connected with the signal input of filtration module, the interference that filtration module filtering electric pulse causes, pass the signal to intermediate frequency amplification module after filtration module filtering interfering and carry out intermediate frequency amplification, Doppler's extraction module carries out Doppler signal extraction to the signal after intermediate frequency amplification, amplification module carries out amplification process to the Doppler signal extracted, and the signal after amplifying is sent to the treatment and analysis that message processing module carries out Doppler signal.
2. a kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system according to claim 1, it is characterized in that: it also comprises record storage, described record storage is connected with message processing module, the leakage signal of this reception and analysis processing result thereof are sent to record storage and preserve by message processing module, so that host computer extracts historical data.
3. a kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system according to claim 1, is characterized in that: described amplification module is the amplifier of level Four cascade.
4. a kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system according to claim 1, it is characterized in that: described amplification module is programmable amplifier, programmable amplifier is made up of operational amplifier and periphery resistor network.
5. a kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system according to claim 1, it is characterized in that: it also comprises keyboard and display, described keyboard is connected with the input through keyboard of message processing module, can parameters information by keyboard, display is connected with the display translation of message processing module, display display configuration information, analysis processing result and warning message.
6. a kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system according to claim 1, it is characterized in that: it also comprises power module, described power module is connected with transmitter module, receiver module and message processing module, for it provides power supply.
7. a kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system according to claim 1, it is characterized in that: it also comprises phase demodulation modules, the input of described phase demodulation modules is connected with the output of Doppler's extraction module, and the output of phase demodulation modules is connected with the input of amplification module.
8. a kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system according to claim 1, it is characterized in that: it also comprises power splitter, the input of described power splitter is connected with the output of local oscillator, an output of power splitter is connected with the input of transmitter module, and another of power splitter exports to input with one of frequency mixer and be connected.
9. a kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system according to claim 8, is characterized in that: described power splitter is one-to-two power splitter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420527913.4U CN204044958U (en) | 2014-09-15 | 2014-09-15 | A kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system |
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| CN201420527913.4U CN204044958U (en) | 2014-09-15 | 2014-09-15 | A kind of low rate of false alarm leakage cable intrusion detector with arrowband frequency conversion receiving system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104635062A (en) * | 2015-01-23 | 2015-05-20 | 北京邮电大学 | Environment electromagnetic radiation monitoring system |
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2014
- 2014-09-15 CN CN201420527913.4U patent/CN204044958U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104635062A (en) * | 2015-01-23 | 2015-05-20 | 北京邮电大学 | Environment electromagnetic radiation monitoring system |
| CN104635062B (en) * | 2015-01-23 | 2018-05-29 | 北京邮电大学 | A kind of electromagnetic radiation from environment monitors system |
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